<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      ></el-alert>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <!-- 商品分类的级联选择器 -->
              <el-cascader
                expand-trigger="hover"
                :options="catelist"
                :props="cateProps"
                v-model="addForm.goods_cat"
                @change="handleChange"
              >
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的动态属性的item -->
            <el-form-item
              v-for="item in manyTableData"
              :key="item.attr_id"
              :label="item.attr_name"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="v" v-for="(v,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item v-for="item in onlyTableData" :key="item.attr_id" :label="item.attr_name">
              <el-input v-model="item.attr_vals">
              </el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3"> 
             <!-- action 表示图片要上传到的后台API地址 -->
            <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4"> 
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="addGoods">
              添加商品
            </el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog
  title="图片预览"
  :visible.sync="previewVisible"
  width="50%">
  <img :src="previewPath" alt="" class="previewImg">
  
</el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      //高亮显示对应的步骤条
      //隐式转换:利用减法运算 将字符串转数字
      activeIndex: "0",
      //添加商品的表单数据对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_number: 0,
        goods_weight: 0,
        //商品所属的分类数组
        goods_cat: [],
        //保存图片的数组 图片上传成功之后，需要将图片路径保存到pics中
        pics:[],
        //商品的详细描述
        goods_introduce:'',
        //添加商品的属性参数
        attrs:[]
      },
      //添加商品的表单验证规则对象
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" },
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" },
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" },
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" },
        ],
        goods_cat: [
          { required: true, message: "请选择商品分类", trigger: "blur" },
        ],
      },
      //商品分类数据列表
      catelist: [],
      //级联选择器的props属性配置
      cateProps: {
        label: "cat_name",
        value: "cat_id",
        children: "children",
      },
      //动态参数列表数据
      manyTableData: [],
      //静态属性列表数据
      onlyTableData:[],
      //上传图片的url地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      //图片上传组件的headers请求头对象
      headerObj:{
        Authorization:window.sessionStorage.getItem('token')
      },
      //存储图片的预览路径
      previewPath:'',
      //图片预览对话框的显示与隐藏
      previewVisible: false,
    };
  },
  created() {
    //调用获取所有商品分类的函数
    this.getCateList();
  },
  //计算属性
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        //将商品分类的三级id返回出去
        return this.addForm.goods_cat[2];
      }
      return null;
    },
  },
  methods: {
    //获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类数据失败");
      }
      this.catelist = res.data;
    },
    //级联选择器的选中项发生变化时触发的函数
    handleChange() {
      console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },
    //阻止页签切换,在添加完成基本信息后才能向后切换
    beforeTabLeave(activeName, oldActiveName) {
      // console.log('即将离开的页签的名字是' + oldActiveName);
      // console.log('即将进入的页签的名字是' + activeName);
      // return false

      //如果即将离开的页签是基本信息（name为0），这时候就需要判断商品分类是否是三级
      //如果商品分类不等于3，说明没有选择商品分类，就直接返回false，那么页签就不会切换成功
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        //提示
        this.$message.info("请选择商品分类");
        return false;
      }
    },
    //tabs栏左侧的点击事件处理函数
    async tabClicked() {
      // console.log(this.activeIndex);
      //判断是否点击的是商品参数面板
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "many" },
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("获取动态参数列表失败");
        }
        console.log(res.data);
        //此时res.data里的attr_vals为字符串类型的数据需要转化为数组类型的
        res.data.forEach(item => {
            item.attr_vals = item.attr_vals.length ? item.attr_vals.split(',') : []
        })
        this.manyTableData = res.data;
      } else if (this.activeIndex === '2') {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'only'}
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败!')
        }
        // console.log(res.data);
        this.onlyTableData = res.data
      }
    },
    //处理图片的预览效果
    handlePreview(file) {
      console.log(file);
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    //处理移除图片的操作
    handleRemove(file) {
      //  console.log(file);
      //1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      //2.从pics数组中,找到这个图片对应的索引值
      const index = this.addForm.pics.findIndex(item => item.pic === filePath)
      //3.调用数组的splice方法,将对应的图片移除
      this.addForm.pics.splice(index,1)
      // console.log(this.addForm);
    },
    //监听图片上传成功的事件
    handleSuccess(response) {
        // console.log(response);
        //1.拼接得到一个图片信息对象
        const picInfo = {pic:response.data.tmp_path}
        //2.将图片信息对象添加到数组中
        this.addForm.pics.push(picInfo)
        console.log(this.addForm);
    },
    //添加商品的执行函数
    addGoods() {
      this.$refs.addFormRef.validate( async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项!')
        }
        //执行添加的业务 另一种方法
        //处理添加商品的属性数据类型
        this.addForm.attrs = [
          //...展开符
          //处理动态参数
          ...this.manyTableData.map(item => {
            return {
              attr_id:item.attr_id,
              attr_value:item.attr_vals.join(',')
            }
          }),
          //处理静态属性
          ...this.onlyTableData.map(item => {
            return {
              attr_id:item.attr_id,
              attr_value:item.attr_vals
            }
          })
        ]
        // console.log(this.addForm.attrs);
        const {data:res} = await this.$http.post('goods',{
          ...this.addForm,
          //商品所属的分类
          goods_cat:this.addForm.goods_cat.join(','),
          //图片的路径  图片后台只需要每项上的pic属性
          pics:this.addForm.pics.map(item => item.pic)
        })
        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg)
        }
        this.$message.success(res.meta.msg)
        //添加成功,返回上一级路径
        this.$router.push('/goods')
      })
    }
  },
};
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>